US5650005A - Process for high free lime content in cement clinker - Google Patents

Process for high free lime content in cement clinker Download PDF

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Publication number
US5650005A
US5650005A US08/654,841 US65484196A US5650005A US 5650005 A US5650005 A US 5650005A US 65484196 A US65484196 A US 65484196A US 5650005 A US5650005 A US 5650005A
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US
United States
Prior art keywords
clinker
cement clinker
content
lime
process according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US08/654,841
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English (en)
Inventor
George Chris Kistler
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Lafarge Canada Inc
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Lafarge Canada Inc
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Priority to US08/654,841 priority Critical patent/US5650005A/en
Assigned to LAFARGE CANADA INC. reassignment LAFARGE CANADA INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KISTLER, GEORGE CHRIS
Priority to CA002189804A priority patent/CA2189804C/fr
Application granted granted Critical
Publication of US5650005A publication Critical patent/US5650005A/en
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Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/47—Cooling ; Waste heat management

Definitions

  • the invention relates to a process for control of the free lime content of cement clinker, more especially for elevating the normal free lime content of cement clinker.
  • the invention may be employed in these different processes including the long dry process, the wet process, the preheater process and the precalciner process.
  • calcium carbonate in the ingredients is thermally decomposed to lime (calcium oxide).
  • the temperature in the calcining zone is typically 825° to 1000° C.
  • a phase equilibria occurs, a liquid content of 20-30%, by weight, forms and chemical reactions occur at the interface of solid and liquid surfaces. Crystalline silicate phases are formed which are separated by interstitial liquid.
  • the Portland Cement zone of the equilibrium ternary system, CaO--Al 2 O 3 --SiO 2 is relatively small and a high content of reacted lime has been favoured, in part by the conventional desire to maintain the uncombined lime at a low level.
  • the upstream cooling zone In the upstream cooling zone, initial cooling of the clinker commences: the upstream cooling zone is typically at a temperature of about 1300° to 1400° C.
  • lime itself, calcium bicarbonate, marl, marble and aragonite may also be employed.
  • the free lime content of cement clinker may be determined in accordance with ASTM C114, Section 27. Free Calcium Oxide, described in the 1994 Annual Book of ASTM Standards, Section 4, Construction, Volume 04.01 Cement; Lime; Gypsum, pages 112-113.
  • ASTM C114 Section 27. Free Calcium Oxide, described in the 1994 Annual Book of ASTM Standards, Section 4, Construction, Volume 04.01 Cement; Lime; Gypsum, pages 112-113.
  • There are two test methods available under this standard one being a modified Franke procedure in which uncombined lime is titrated with dilute perchloric acid after solution in an ethylacetoacetate-isobutyl alcohol solvent; the other being an ammonium acetate titration of the alcohol-glycerin solution of uncombined lime with Sr(No 3 ) 2 as an accelerator.
  • a kiln assembly 10 includes a feed inlet 12, a long rotary kiln 14 and a cooler 16.
  • the kiln 14 is mounted for rotation relative to feed inlet 12 and cooler 16.
  • Rotary kiln 14 has a drying zone 20, for use in a wet process, a calcining zone 22, a burning zone 24 and an initial cooling zone 26.
  • Cooler 16 has a cooling zone 34, the clinker at the upstream end is at about 1300° C.
  • raw cement clinker ingredients in particulate form are fed through inlet 12 and feed port 18 into the kiln 14, where they first enter drying zone 20.
  • the kiln 14 rotates slowly, and is inclined downwardly from port 18 to outlet 28. With rotation of kiln 14, the ingredients advance slowly and sequentially through drying zone 20, calcining zone 22 and burning zone 24; into which a flame extends from burner nozzle 32.
  • the drying zone 20 typically employs mobile chains and hot gas flow in counter flow to the raw ingredients.
  • the formed clinker passes from cooler 16 to storage, optionally via a grinding stage.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
US08/654,841 1996-05-29 1996-05-29 Process for high free lime content in cement clinker Expired - Lifetime US5650005A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US08/654,841 US5650005A (en) 1996-05-29 1996-05-29 Process for high free lime content in cement clinker
CA002189804A CA2189804C (fr) 1996-05-29 1996-11-07 Methode servant a augmenter la quantite de chaux libre contenue dans le clinker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/654,841 US5650005A (en) 1996-05-29 1996-05-29 Process for high free lime content in cement clinker

Publications (1)

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US5650005A true US5650005A (en) 1997-07-22

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US08/654,841 Expired - Lifetime US5650005A (en) 1996-05-29 1996-05-29 Process for high free lime content in cement clinker

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US (1) US5650005A (fr)
CA (1) CA2189804C (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5837052A (en) * 1997-04-10 1998-11-17 Lafarge Canada Inc. Process for producing cement clinker containing coal ash
US5891239A (en) * 1996-07-17 1999-04-06 Italcement, S.P.A. Quick-setting cement containing clinker based on calcium fluoro-aluminate mixed with lime
WO2000018699A1 (fr) * 1998-09-24 2000-04-06 Lafarge Canada Inc. Procede de production de clinker au laitier
US6165357A (en) * 1999-01-27 2000-12-26 Cormier; Jacques Roof drain cover
US6391105B1 (en) 2001-02-16 2002-05-21 Lafarge Canada Inc. Enhancement of cement clinker yield
US20040118323A1 (en) * 2002-12-23 2004-06-24 Oates David Bridson Process for incorporating coal ash into cement clinker
US20050000274A1 (en) * 2001-10-01 2005-01-06 Wolfgang Schrof Method and device for analyzing the hardening of hardenable formulations
JP2014069990A (ja) * 2012-09-28 2014-04-21 Mitsubishi Materials Corp セメントクリンカーの製造方法とセメントクリンカー、およびセメント組成物

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884710A (en) * 1972-10-27 1975-05-20 Gen Portland Inc Expansive cement
US3998649A (en) * 1974-09-23 1976-12-21 Gorresens Inc. Process of manufacturing Portland cement clinker
US4102700A (en) * 1975-08-27 1978-07-25 Perlmooser Zementwerke Aktiengesellschaft Process for the production of a mixture to be utilized in the production of building materials and a device for carrying out the process
US4504319A (en) * 1982-12-04 1985-03-12 Klockner-Humboldt-Deutz Ag Method and apparatus for burning cement clinker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884710A (en) * 1972-10-27 1975-05-20 Gen Portland Inc Expansive cement
US3998649A (en) * 1974-09-23 1976-12-21 Gorresens Inc. Process of manufacturing Portland cement clinker
US4102700A (en) * 1975-08-27 1978-07-25 Perlmooser Zementwerke Aktiengesellschaft Process for the production of a mixture to be utilized in the production of building materials and a device for carrying out the process
US4504319A (en) * 1982-12-04 1985-03-12 Klockner-Humboldt-Deutz Ag Method and apparatus for burning cement clinker

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5891239A (en) * 1996-07-17 1999-04-06 Italcement, S.P.A. Quick-setting cement containing clinker based on calcium fluoro-aluminate mixed with lime
US5837052A (en) * 1997-04-10 1998-11-17 Lafarge Canada Inc. Process for producing cement clinker containing coal ash
WO2000018699A1 (fr) * 1998-09-24 2000-04-06 Lafarge Canada Inc. Procede de production de clinker au laitier
US6165357A (en) * 1999-01-27 2000-12-26 Cormier; Jacques Roof drain cover
US6391105B1 (en) 2001-02-16 2002-05-21 Lafarge Canada Inc. Enhancement of cement clinker yield
US20050000274A1 (en) * 2001-10-01 2005-01-06 Wolfgang Schrof Method and device for analyzing the hardening of hardenable formulations
US20040118323A1 (en) * 2002-12-23 2004-06-24 Oates David Bridson Process for incorporating coal ash into cement clinker
US6764544B2 (en) * 2002-12-23 2004-07-20 Lafarge Canada Inc. Process for incorporating coal ash into cement clinker
JP2014069990A (ja) * 2012-09-28 2014-04-21 Mitsubishi Materials Corp セメントクリンカーの製造方法とセメントクリンカー、およびセメント組成物

Also Published As

Publication number Publication date
CA2189804C (fr) 2002-03-12
CA2189804A1 (fr) 1997-11-29

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